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ALSA: scarlett2: Add support for the internal "standalone" switch

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The Focusrite Scarlett Gen 2/3 interfaces with internal mixers have a
"standalone" mode. When the interface is not connected to a USB host
and standalone mode is enabled, the interface will pass audio as
previously configured. This patch adds an ALSA control to allow
enabling/disabling that mode.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/cd88871c5e77abd5c23a4758a1f2ec9fd427fd69.1646578164.git.g@b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Geoffrey D. Bennett 2022-03-07 01:51:39 +10:30 committed by Takashi Iwai
parent 441d1e1047
commit 604b388419
1 changed files with 90 additions and 7 deletions
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97
sound/usb/mixer_scarlett_gen2.c
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@ -60,6 +60,7 @@
* - phantom power, direct monitor, speaker switching, and talkback
* controls
* - disable/enable MSD mode
* - disable/enable standalone mode
*
* <ditaa>
* /--------------\ 18chn 20chn /--------------\
@ -411,6 +412,7 @@ struct scarlett2_data {
u8 talkback_switch;
u8 talkback_map[SCARLETT2_OUTPUT_MIX_MAX];
u8 msd_switch;
u8 standalone_switch;
struct snd_kcontrol *sync_ctl;
struct snd_kcontrol *master_vol_ctl;
struct snd_kcontrol *vol_ctls[SCARLETT2_ANALOGUE_MAX];
@ -936,13 +938,14 @@ enum {
SCARLETT2_CONFIG_PAD_SWITCH = 5,
SCARLETT2_CONFIG_MSD_SWITCH = 6,
SCARLETT2_CONFIG_AIR_SWITCH = 7,
SCARLETT2_CONFIG_PHANTOM_SWITCH = 8,
SCARLETT2_CONFIG_PHANTOM_PERSISTENCE = 9,
SCARLETT2_CONFIG_DIRECT_MONITOR = 10,
SCARLETT2_CONFIG_MONITOR_OTHER_SWITCH = 11,
SCARLETT2_CONFIG_MONITOR_OTHER_ENABLE = 12,
SCARLETT2_CONFIG_TALKBACK_MAP = 13,
SCARLETT2_CONFIG_COUNT = 14
SCARLETT2_CONFIG_STANDALONE_SWITCH = 8,
SCARLETT2_CONFIG_PHANTOM_SWITCH = 9,
SCARLETT2_CONFIG_PHANTOM_PERSISTENCE = 10,
SCARLETT2_CONFIG_DIRECT_MONITOR = 11,
SCARLETT2_CONFIG_MONITOR_OTHER_SWITCH = 12,
SCARLETT2_CONFIG_MONITOR_OTHER_ENABLE = 13,
SCARLETT2_CONFIG_TALKBACK_MAP = 14,
SCARLETT2_CONFIG_COUNT = 15
};
/* Location, size, and activation command number for the configuration
@ -998,6 +1001,9 @@ static const struct scarlett2_config
[SCARLETT2_CONFIG_PAD_SWITCH] = {
.offset = 0x84, .size = 8, .activate = 8 },
[SCARLETT2_CONFIG_STANDALONE_SWITCH] = {
.offset = 0x8d, .size = 8, .activate = 6 },
/* Gen 3 devices: 4i4, 8i6, 18i8, 18i20 */
}, {
[SCARLETT2_CONFIG_DIM_MUTE] = {
@ -1021,6 +1027,9 @@ static const struct scarlett2_config
[SCARLETT2_CONFIG_AIR_SWITCH] = {
.offset = 0x8c, .size = 8, .activate = 8 },
[SCARLETT2_CONFIG_STANDALONE_SWITCH] = {
.offset = 0x95, .size = 8, .activate = 6 },
[SCARLETT2_CONFIG_PHANTOM_SWITCH] = {
.offset = 0x9c, .size = 1, .activate = 8 },
@ -3502,6 +3511,69 @@ static int scarlett2_add_msd_ctl(struct usb_mixer_interface *mixer)
0, 1, "MSD Mode Switch", NULL);
}
/*** Standalone Control ***/
static int scarlett2_standalone_ctl_get(struct snd_kcontrol *kctl,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kctl->private_data;
struct scarlett2_data *private = elem->head.mixer->private_data;
ucontrol->value.integer.value[0] = private->standalone_switch;
return 0;
}
static int scarlett2_standalone_ctl_put(struct snd_kcontrol *kctl,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kctl->private_data;
struct usb_mixer_interface *mixer = elem->head.mixer;
struct scarlett2_data *private = mixer->private_data;
int oval, val, err = 0;
mutex_lock(&private->data_mutex);
oval = private->standalone_switch;
val = !!ucontrol->value.integer.value[0];
if (oval == val)
goto unlock;
private->standalone_switch = val;
/* Send switch change to the device */
err = scarlett2_usb_set_config(mixer,
SCARLETT2_CONFIG_STANDALONE_SWITCH,
0, val);
if (err == 0)
err = 1;
unlock:
mutex_unlock(&private->data_mutex);
return err;
}
static const struct snd_kcontrol_new scarlett2_standalone_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "",
.info = snd_ctl_boolean_mono_info,
.get = scarlett2_standalone_ctl_get,
.put = scarlett2_standalone_ctl_put,
};
static int scarlett2_add_standalone_ctl(struct usb_mixer_interface *mixer)
{
struct scarlett2_data *private = mixer->private_data;
if (private->info->config_set == SCARLETT2_CONFIG_SET_NO_MIXER)
return 0;
/* Add standalone control */
return scarlett2_add_new_ctl(mixer, &scarlett2_standalone_ctl,
0, 1, "Standalone Switch", NULL);
}
/*** Cleanup/Suspend Callbacks ***/
static void scarlett2_private_free(struct usb_mixer_interface *mixer)
@ -3663,6 +3735,12 @@ static int scarlett2_read_configs(struct usb_mixer_interface *mixer)
if (info->config_set == SCARLETT2_CONFIG_SET_NO_MIXER)
return 0;
err = scarlett2_usb_get_config(
mixer, SCARLETT2_CONFIG_STANDALONE_SWITCH,
1, &private->standalone_switch);
if (err < 0)
return err;
err = scarlett2_update_sync(mixer);
if (err < 0)
return err;
@ -3985,6 +4063,11 @@ static int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer)
if (err < 0)
return err;
/* Create the standalone control */
err = scarlett2_add_standalone_ctl(mixer);
if (err < 0)
return err;
/* Set up the interrupt polling */
err = scarlett2_init_notify(mixer);
if (err < 0)